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WHOIS
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DNS ÁúÀÇ TimeOutÀÇ Áø½ÇÀº..
ÀÛ¼ºÀÏ : 2010/11/03 20:14
±Û¾´ÀÌ : ¹ü³ÃÀÌ
Á¶È¸¼ö : 11099
[
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Ä¿ÇǴнº ä³Î irc ä³Î(
http://coffeenix.net/bbs/viewtopic.php?p=1114#1114
) ¿¡¼ sCag´ÔÀÌ DNS ¼¼¹Ì³ª¿¡¼ º¸´Ï "DNS ÁúÀÇ timeoutÀÌ µðÆúÆ® °ªÀÌ 5Ãʰ¡ ¾Æ´Ï¶ó ½ÇÁö·Î 1Ãʹ̸¸ÀÇ °á°ú"°¡ ³ª¿Ô´Ù ¶ó´Â ¸»ÀÇ ½ÃÃÊ·Î È®ÀÎÇØ º» »çÇ×ÀÔ´Ï´Ù.
°ú¿¬ DNS ÁúÀÇ timeoutÀÌ µðÆúÆ®°¡ 5ÃÊ Àϱî¿ä? 1ÃÊ ¹Ì¸¸Àϱî¿ä? ÀÌ¿¡ Å×½ºÆ®¸¦ ÇØº¸¾Ò½À´Ï´Ù.
0. ±âº» Á¤º¸
- default °ªÀº /usr/include/resolv.h ÀÇ ÁöÁ¤
- RES_TIMEOUT 5 <-- /* min. seconds between retries */ <- 5ÃÊ?
- RES_DFLRETRY 2 <-- /* Default #/tries. */ <-- 2¹ø?
1. Å×½ºÆ® ȯ°æ
OS : Centos 4
µµ±¸ : dig, nslookup
2. Å×½ºÆ® ³»¿ª(dig, nslookup °¢°¢)
1) Primary Á¤»ó, Secondary Á¤»ó
2) Primary ºñÁ¤»ó, Secondary Á¤»ó
3) Primary Á¤»ó
4) Primary ºñÁ¤»ó
3. Å×½ºÆ® °á°ú
1) Primary Á¤»ó, Secondary Á¤»ó
=========================================
# cat /etc/resolv.conf
serarch xxxxxxxx.com
nameserver 58.227.193.227 <-- Çϳª·Î ij½Ì?
nameserver 164.124.101.2 <-- ÆÄ¿öÄÞ?
# time dig www.naver.com
°ÅµÎÀý¹Ì(Ưº°È÷ °á°ú¸¦ ÀûÁö ¾Ê°í ½Ã°£¸¸ ±âÀçÇÕ´Ï´Ù. )
real 0m0.006s
user 0m0.002s
sys 0m0.004s
(primary dns¿¡¼ °¡Á®¿Â °ª)
# time nslookup www.naver.com
À̰͵µ °ÅµÎÀý¹Ì(ÇØº¸¸é ¾Æ½ÃÁÒ? Ưº°È÷ °á°ú¸¦ ÀûÀ» ÇÊ¿ä´Â..¤¾¤¾)
real 0m0.005s
user 0m0.000s
sys 0m0.005s
(primary dns¿¡¼ °¡Á®¿Â °ª)
===========================================
** µÑ´Ù Á¤»óÀûÀ¸·Î Àß °¡Á®¿É´Ï´Ù. ¹°·Ð Primary ¿¡ Á¤»óÀûÀ¸·Î °¡Á®¿Â °ÅÁÒ!!
2) Primary ºñÁ¤»ó, Secondary Á¤»ó
=========================================
# cat /etc/resolv.conf
serarch xxxxxxxx.com
nameserver xxx.xxx.xxx.xxx <-- ¾Æ¹« IP³ª ¤¾¤¾;
nameserver 164.124.101.2 <-- ÆÄ¿öÄÞ?
# time dig www.naver.com
°ÅµÎÀý¹ÌÇϰí
real 0m1.010s
user 0m0.000s
sys 0m0.005s
(secondary dns¿¡¼ °¡Á®¿Â °ª)
# time nslookup www.naver.com
°ÅµÎÀý¹Ì
real 0m1.009s
user 0m0.000s
sys 0m0.004s
(secondary dns¿¡¼ °¡Á®¿Â °ª)
===========================================
** 1ÃÊÀÇ Delay°¡ °É¸³´Ï´Ù. (¸î ¼ö½Ê¹ø ÇØºÁµµ µü 1ÃÊ delay°¡ °É¸³´Ï´Ù.)
3) Primary Á¤»ó(primary¸¸ ÁöÁ¤.)
=========================================
# cat /etc/resolv.conf
serarch xxxxxxxx.com
nameserver 58.227.193.227 <-- Çϳª·Î ij½Ì ¼¹ö
# time dig www.naver.com
°ÅµÎÀý¹Ì
real 0m0.006s
user 0m0.003s
sys 0m0.002s
(primary dns¿¡¼ °¡Á®¿Â °ª)
# time nslookup www.naver.com
À̰͵µ °ÅµÎÀý¹Ì
real 0m0.006s
user 0m0.002s
sys 0m0.003s
(primary dns¿¡¼ °¡Á®¿Â °ª)
===========================================
** primary¿¡¼ Á¤»óÀûÀ¸·Î Àß °¡Á®¿É´Ï´Ù.
4) Primary ºñÁ¤»ó(primary ¸¸ ÁöÁ¤)
=========================================
# cat /etc/resolv.conf
serarch xxxxxxxx.com
nameserver xxx.xxx.xxx.xxx <-- ¾Æ¹« IP³ª!!
# time dig www.naver.com
°ÅµÎÀý¹Ì
real 0m15.010s
user 0m0.001s
sys 0m0.003s
# time nslookup www.naver.com
À̰͵µ °ÅµÎÀý¹Ì
real 0m15.010s
user 0m0.001s
sys 0m0.003s
===========================================
** 15ÃÊ °É¸³´Ï´Ù. 15Ãʳª °É¸³´Ï´Ù. ¿Ö 15Ãʳª °É¸±±î¿ä..???
ÀÌ°Ç retry°¡ Àֱ⠶§¹®ÀÔ´Ï´Ù. ±â´Ù·È´Âµ¥ ¾È µÇ¾ú´Ù°í ÇÑ ¹ø¸¸ º¸³»´Â°ÍÀÌ ¾Æ´Ï¶ó ¸î ¹ø º¸³»´Â°ÍÀÌÁÒ. ÀÌ¿Í °ü·ÃÇØ¼´Â ½Ã°£ ³¯¶§ µû·Î ¿Ã·Á º¸°Ú½À´Ï´Ù.
4. °á·Ð
°á·ÐÀº °£´Ü ÇÕ´Ï´Ù. dig, nslookupÀÇ °æ¿ì
1. secondary°¡ Á¸ÀçÇϸé Primary Äõ¸®ÀÇ °á°ú°¡ ¿À±â¸¦ 1Ãʸ¸ ±â´Ù¸®°í ¹Ù·Î secondary·Î Äõ¸® ¿äûÀ» ÇÕ´Ï´Ù.
2. secondary°¡ Á¸ÀçÇÏÁö ¾ÊÀ¸¸é? ¿ì¸®°¡ ÈçÈ÷ ¸»ÇÏ´Â Default °ª¿¡ Ãæ½ÇÇÕ´Ï´Ù. 5ÃÊ ¿Í retry ¼ö¿¡ µû¶ó º¯ÇÏ°Ô µÇ´Â °ÍÀÌÁÒ.
°£´ÜÇÏÁÒ?
** DNS Äõ¸® TimeoutÀº »ç¿ëÇÏ´Â ¾îÇø®ÄÉÀ̼ǿ¡ ¿µÇâÀ» ¹Þ´Â´Ù´Â°É ±â¾ïÇÏ½Ã¸é µË´Ï´Ù. ´Ù¸¥ Åø¿¡¼´Â ´Ù¸£°Ô µ¿ÀÛÇÒ ¼ö ÀÖ½À´Ï´Ù. ±×·¯³ª, ´ëºÎºÐÀÇ ÅøÀº Primary DNSÀÇ ÀÀ´äÀ» 5ÃÊ ±â´Ù¸®°í retry ±îÁö ÇÏÁö´Â ¾Ê°ÚÁÒ?? Secondary°¡ Àִµ¥~~~
Ä¿ÇǴнº Ä«Æä ÃÖ±Ù ±Û
[04/24]
ÇÑÆí, &
[04/22]
Re: ¿µÈ¼Ó¿¡ ÄÄÇ»ÅÍ À̾߱â ~½º¿öµåÇǽ¬(2001)
[04/22]
¾ß°£
[04/20]
ปัÅ
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[04/19]
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[04/17]
°·ÂÇØÁø žç Ȱµ¿, ÃÊ´ëÇü ÅÂ¾ç ÆøÇ³À¸·Î "Áö±¸ ´ëÀç³ À§±â"
[10/20]
Cross Compiler ±ò
[07/14]
SSL ¬¡¬°
[04/26]
Re: µµ½ºÈ¸é ¿ø°ÝÁ¶Á¾ ¿©ºÎ
[04/25]
µµ½ºÈ¸é ¿ø°ÝÁ¶Á¾ ¿©ºÎ
[10/30]
Cshell¿¡¼ ³¼ö ¼³Á¤
[10/23]
°øÇ×öµµÁÖ½Äȸ»ç SE ±¸ÀÎ Ëì
[01/26]
Re: wgetÀ¸·Î ´Ù¸¥¼¹ö¿¡ÀÖ´Â µð·ºÅ丮¸¦ °¡Á®¿À·Á°íÇÕ´Ï´Ù.
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The Hello World Collection
IPMI¸¦ Ȱ¿ëÇÑ ¸®´ª½º ¼¹ö°ü¸®
DNS ¼³Á¤ °Ë»ç
nagiosgraph ¼³Ä¡ ¹æ¹ý
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Qmail±â¹ÝÀÇ Anti spam ½Ã½ºÅÛ ±¸ÃàÇϱâ
clusterssh
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